Plugable UD-160-A driving 1920x1080 display and more, all from a humble Nexus One phone

This setup uses the udlfb DisplayLink Linux driver work from here (git.plugable.com) and a bunch of other components Sven has developed or pulled together, to turn the phone into a full computer with display, keyboard, audio and more. His video of this has gone viral (over 85,000 views). You can see the video and full instructions at Sven’s site. Very cool.

The photo above is of the Plugable UD-160-A Universal Docking Station, in use at Sven’s desk (the dock is laying on its side to better fit in the photo – Sven has removed the weighted bottom stand).

The Plugable dock is perfect for this kind of application with the Nexus One phone — it includes all the USB devices in one place, all with open source drivers. The dock has its own 2.5A AC power (see the USB dual-power Y cable plugged into the front USB A and back USB B ports), along with driving the 1920×1080 monitor (the big DVI cable in the back), and providing ethernet (above the DVI) and audio (in the front – he doesn’t have them plugged in in the pic).

So this all is great for geeks, but when will this work out of the box? Several comments on Sven’s work are messages like “Google! Integrate this into Android now!”

With Google offices near here, and with related USB terminal work on the same Plugable dock being funded as a Google Summer of Code project, it would be great to demo this and get things moving… Whatcha say, Google!?

Unfortunately, on Mac OS X, there is a conflict between recent DisplayLink drivers 1.5+ and the Apple drivers (AppleUSBEthernet) for ASIX chips. The DisplayLink drivers appear to open other USB devices as part of enumeration. As a side effect, this causes USB ethernet devices to show as “disconnected” upon return from system boot or hibernate.

That’s in addition to other graphics and ethernet driver compatibility breaks that Apple’s recent OS X 10.6 updates have introduced, including breaking AppleUSBEthernet for non-Apple USB ethernet hardware.

Until these issues settle down and are fixed in the drivers from DisplayLink, ASIX, and Apple, here is a workaround for the current issues with the ethernet function of the Plugable Universal Docking Station:

Step 1 is to download and install ASIX drivers that are compatible with recent Mac OS X 10.6: http://plugable.com/wp-content/uploads/2010/04/AppleDefaultDriver_v2.1.5.zip

Step 2 is to copy the following script to a file (call it “install”), and run “sudo ./install”

#!/bin/bash
sudo echo "#!/bin/bash" > /usr/bin/plugable-eth-reset
sudo echo kextunload -b com.apple.driver.AppleUSBEthernet >> /usr/bin/plugable-eth-reset
sudo echo kextload -b com.apple.driver.AppleUSBEthernet >> /usr/bin/plugable-eth-reset
sudo chown root /usr/bin/plugable-eth-reset
sudo chmod o+x /usr/bin/plugable-eth-reset
sudo defaults write com.apple.loginwindow LoginHook /usr/bin/plugable-eth-reset

Now, logging out and logging back in will automatically reload the ethernet driver. Unfortunately, this does not cover the return from low-power cases. Unless we find an improvement to the workaround, you’ll have to log out/log in or just run “sudo /usr/bin/eth-reset” so trigger the script.

As there may be variations in systems out there, please comment if you get different results, and we’ll post an update here at Plugable if (as we hope) this is fixed more directly in the DisplayLink or ASIX drivers in the future.

And, generally if you’re a Mac OS X user, please be cautious about OS updates which might break 3rd party hardware drivers. If you have non-Apple USB hardware, consider deferring updates until there’s time for other people to report on forums about compatibility.

For those that have been waiting — thank you for your patience!

Improvements in the new UGA-2K-A adapters include:

• Updated USB plug and play ID and strings unique to the Plugable UGA-2K-A
• Fix for a voltage problem with DVI connected monitors that occasionally required unplugging both USB and DVI to reset the device
• Groundwork laid for compliance with the “DisplayLink Certified” program

And all the great software compatibility features are the same, including automatic detection, download, and install of drivers via Microsoft’s Windows Update system for Windows 7, Vista, and XP. Mac and Linux compatibility are the same (see product page for limitations — there are important ones to note).

Thank you to all our customers who buy Plugable products! We really appreciate your support.

The goal of their project was to get an embedded platform working on Centos 5.3. You can read more in their release note for the work.

To make the contributions easier to diff, they’ve been checked into a git branch from a (best guess) of the code Endurance started from.

The changes are available here for the kernel driver and here for the X server.

To actually build it, you may need their full package.

It’s unclear what of these changes might get picked up, as things have moved on since. One of the main features of this code is providing a default EDID blob in udlfb. The plan for udlfb at this point is to allow the edid sysfs interface of udlfb to be written to, to allow (and give responsibility) to a user-mode entity to supply a default edid, if one isn’t available from hardware.

Thanks again to Endurance for being diligent about contributing changes back.

We’re very excited about the Google funded project to refine USB multiseat on Linux, with the winning proposal from Lucas Nascimento Ferreira at the Federal University of Parana in Brazil.

In addition to providing mentoring, Plugable is also providing donated hardware for this project. Two Plugable Universal Docking stations with recent enhancements for use as a terminal, were just picked up by Lucas in Brazil today. By next month, we expect to have updated versions of the UGA-125-HUB for terminal use to send down.

For those interested in learning more and potentially following Lucas’ work:

• Google’s SoC 2010 Timeline
• Lucas’ winning USB Multiseat Proposal

And we’ll post periodic status updates here.

We do this because we know you use a mix of machines, or may be thinking about switching one way or another. And when you invest in a collection of USB devices, you want them to be useful beyond your current computer. That’s what we expect, too.

All this activity can get a little noisy, though. A little too much information.

That’ll be especially true for some exciting but technically involved work that’s happening over the next few months on Linux with the Google Summer of Code project for USB multiseat, which makes use of some of our Plugable hardware.

So if you’re interested in just one platform or another, here is a way to get just the news that you care about, and get rid of the rest of the noise:

•  Subscribe – Windows News From Plugable
•  Subscribe – Mac News From Plugable
•  Subscribe – Linux News From Plugable

And for those wanting an even more customized view — just append /feed to the tail end of any category view on the site, to get an even more specific feed, if you’re interested.

Linux hasn’t had that support — it would try to set the highest mode the monitor is capable of, often resulting in a black screen. Especially common for the DL-125 chip, with its mode limits of 1440×900/1280×1024.

That’s a shame because the DL-125 chip is a smart choice in many cases – by limiting itself to those lower modes, it stays more consistently within the limits of the USB 2.0 bus, resulting in more consistent performance.

So coinciding with the launch of Plugable’s DisplayLink DL-125 based products (UGA-125 and UGA-125-HUB), changes have been implemented to bring Linux roughly up to the level of Windows and Mac in this area for DisplayLink devices. This also helps devices like the UD-160-A when running on monitors greater than its limit of 1920×1080.

The kernel framebuffer driver udlfb has been enhanced to read the resolution limit from the firmware descriptors of the device, and adhere to it.

On the X server side, we needed a driver which would limit itself to the resulting reduced mode list. Unfortunately, the existing displaylink X server reads EDID directly, and assumes the adapter can do whatever the monitor can do.

We’ve been wanting to get rid of the need for a displaylink-specific X server, and the standard xf86-video-fbdev driver runs with the best existing mode, rather than trying to set a higher one in EDID. So this was a good trigger for converting over.

So xf86-video-fbdev has been enhanced with X Damage protocol support, ported from Roberto’s displaylink driver. This is still a little in-flux from an interface perspective, but from a functional perspective it’s done and fully performant.

So it’s now possible to run with a modified generic fbdev driver, which talks to udlfb, with full performance and without needing defio (although there’s also some good news in the defio space, which will be posted about later).

You can grab the latest udlfb kernel module with a “git clone http://git.plugable.com/webdav/udlfb”. Compile with “make && sudo make install && sudo depmod -a”

And you can grab the latest modified xf86-video-fbdev with a “git clone http://git.plugable.com/webdav/xf86-video-fbdev”. Compile with “./autogen.sh && make && sudo make install”

You’ll need a very recent xorg-macros version (1.4), which in package “sudo apt-get install xutils-dev”

To use the new X server, you must turn on the new “ReportDamage” option to fbdev. Modify your existing xorg conf like this:

Section "Device"
  Identifier "dl"
  Driver "fbdev"
  Option "ReportDamage" "true"
  Option "fbdev" "/dev/fb0"
EndSection

And you should be all set to go. This new X server should work with the existing udlfb in the staging tree of kernel 2.6.31+ for now, as it’s re-using the same original ioctl. But may require modeset changes that are only in 2.6.34+.

• CrunchGear: Plugable shows off new USB display and docking adapters
• HotHardware: Plugable Technologies Intros New DisplayLink-Enabled USB Products
• NewTechReview: Plugable Technologies USB UGA Docking Stations

Some of our favorite tips from the article:

• Turn on Window’s “Show location of pointer when I press the CTRL key” feature
• The hotkey Win-[up, down, left, right] for maximizing, restoring and moving windows across monitors
• Their recommended links to find cool multimonitor wallpaper

In any case, it’s a must-read post for the multi-monitor aficionado.